cpu/or1k/or1k-context-volatile-clobber.S

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  * COPYRIGHT (c) 2014 Hesham ALMatary <heshamelmatary@gmail.com>
0005  *
0006  * Redistribution and use in source and binary forms, with or without
0007  * modification, are permitted provided that the following conditions
0008  * are met:
0009  * 1. Redistributions of source code must retain the above copyright
0010  *    notice, this list of conditions and the following disclaimer.
0011  * 2. Redistributions in binary form must reproduce the above copyright
0012  *    notice, this list of conditions and the following disclaimer in the
0013  *    documentation and/or other materials provided with the distribution.
0014  *
0015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0016  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0017  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0018  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0019  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0020  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0021  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0024  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0025  * POSSIBILITY OF SUCH DAMAGE.
0026  */
0027
0028 #ifdef HAVE_CONFIG_H
0029 #include "config.h"
0030 #endif
0031
0032 #include <rtems/asm.h>
0033
0034 .section .text
0035
0036 PUBLIC(_CPU_Context_volatile_clobber)
0037 SYM(_CPU_Context_volatile_clobber):
0038
0039 .macro clobber_register reg
0040   l.addi r0, r0, -1
0041   l.addi  \reg, r0, 0
0042 .endm
0043
0044   clobber_register  r3
0045   clobber_register  r4
0046   clobber_register  r5
0047   clobber_register  r6
0048   clobber_register  r7
0049   clobber_register  r8
0050   clobber_register  r13
0051   clobber_register  r31
0052
0053   l.jr  r9
0054   l.nop